#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int bits(int value)
{
	int count = 0;
	while (value)
	{
	
		if (value & 1)
		{
			count++;
		}
		value = value >> 1;
	}
	return count;
}

int main()

{
	int x, y = 0;
	scanf("%d%d", &x, &y);
	int value = x ^ y;
	int count = bits(value);
	printf("%d\n", count);
	return 0;
}